THERMAL SCIENCE

International Scientific Journal

THE INFLUENCE OF ELECTRIC ARC ACTIVATION ON THE SPEED OF HEATING AND THE STRUCTURE OF METAL IN WELDS

ABSTRACT
This paper presents the results of a research related to the impact of electric arc activation onto drive welding energy and metal weld heating speed. It is confirmed that ATIG and AMIG methods, depending on metal thickness, single pass weldability and chemical composition of activating flux, enable the reduction of welding energy by 2-6 times when compared to conventional welding methods. Additionally, these procedures create conditions to increase metal weld heating speed up to 1,500-5,500°C/s-1. Steel which can be rapidly heated, allows for a hardened structure to form (with carbon content up to 0.4%), together with a released martensitic structure or a mixture of bainitic-martensitic structures. Results of the research of effectiveness of ATIG and AMIG welding showed that increase in the penetration capability of electric arc, which increases welding productivity, is the visible side of ATIG and AMIG welding capabilities.
KEYWORDS
PAPER SUBMITTED: 2014-05-30
PAPER REVISED: 2014-04-10
PAPER ACCEPTED: 2014-04-23
PUBLISHED ONLINE: 2014-11-08
DOI REFERENCE: https://doi.org/10.2298/TSCI140530125S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE 1, PAGES [239 - 246]
REFERENCES
  1. Makara A.M, Savytsky M.M., Kushnirenko B.N, and other, The effect of refining on the penetration of metal in arc welding, Automatic Welding, 1977, 9, pp. 7-10, (in Russian)
  2. Lazic V. N., Sedmak A. S., Zivkovic M. M., Aleksandrovic S. M., Cukic R. D., Jovicic R. D., and Ivanovic I. B., Theoretical-Experimental Determining of Cooling Time (T(8/5)) in Hard Facing of Steels for Forging Dies, Thermal Science, 2010, vol. 14, 1, pp. 235-246
  3. Gridnev V.N., Meshkov I.A. Oshkaderov S.P., Trefilov V.I. Physical principles of electro thermal steel reinforcement, Naukova dumka, Kiev, USSR, 1973, (in Russian)
  4. Shorshorov, M.H., Belov V.V. Phase transformations and changes in the steel properties in welding, Naukova dumka, Moskva, USSR, 1972, (in Russian)
  5. Savytsky A.M., Vasiliev V.G., Savytsky M.M. and Vashchenko V.N. Influence of the heating stage on structure formation of welding joints on hardening steels, The Paton Welding Journal, 2005, 1, pp. 15-18
  6. Savytsky O.M. The effects of heating rate on the carbon steel structure in the local thermal influence, Metal Science & Treatment of Metals, 2005, 4, pp. 33-35, (in Ukrainian)
  7. Savytsky O.M., Vashchenko V.N., Shkrabaliuk, I.M. Characteristics of the heating and cooling rate on the carbon steel structure in the local thermal influence, Metal Science & Treatment of Metals, 2011, 3, pp. 26-31, (in Ukrainian)
  8. Dudko D.A., Savytsky A.M., Vasiliev V.G., Novikova D.P. Characteristics of the structure and properties of welding joints formed by thermal influence, Automatic Welding, 1996, 2, pp. 6-7, (in Russian)
  9. Savytsky O.M., Mandrik O.M., Savytsky M.M. Characteristics of constructions and reliability of welded structures in the combined high-pressure vessels, Research and development in the field of oil and gas, 2013, 2, pp. 133-143 (in Ukrainian)
  10. Rikalin N.N., Pugin A.I. Heat processes for fusion welding, Profizdat, Moskva, USSR, 1959, (in Russian)
  11. Niagaj, J., Savytcky, M.M., Savytcky, O.M. The influence of activation on technological and ecological properties of welding arc under argon shield during welding of low and high alloy steels, Bulletin of the Institute of Welding in Gliwice, 2008, 1, pp. 46-50

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence